Need help with 72 hour readmission issue.

I have a question about 72 hour inpatient readmissions. I know that the charges are bundled, but what about the 2 charts? Do you combine them as one with the same medical record number or have a different chart and medical record number for each admission with a copy of the first H&P on the second chart. My medical records department thinks that the charts should be combined, but this just doesn't sound logical and will throw off my LOS stats...Any feed back will be appreciated. Thanks, Susana